In reply to br01wny: Our 'featured' resin-type wall has the same issue wherever the holds aren't placed totally flat to the surface of the wall.
If there's a bolt-hole close to a change in shape of the wall, even a small one, it means the holds can't be done up tightly enough without breaking them..
What we've done is work out which bolts are the persistent offenders, and take a file to the resin around those bolt-holes. Once the surface has been 'flattened out' the holds won't spin nearly as often.
This is pretty drastic though. You'll be lucky if the wall owners are happy about taking chunks out of their lovely expensive wall!